Safety sheave block



Patented ct. l1, 1927.

Unirse "STATES WILLIAM H. MCKISSICK, F TULSA, OKLAHOMA.

SAFETY SHEAVE BLOCK.

Application filed January 11, 1927. Serial 30.160379.

This invention relates to new and useful improvements .in safety sheave blocks.

The object of the invention is to provide a sheave block with a hinged housing arranged when suspended to be opened and swung horizontally to each side, whereby the sheave is exposed for removing and replacing the cable lines. n

Another object of the invention is to provide a housing for completely enclosing the sheave circumferentially of the block, whereby the walls of said housing are free from vertical openings.

A further object of the invention is toV provide in combination with a closed housing, upper guard and spacer members which act to space the supports apart and also to partially close the top of the housing to protect the workmans hands.

A still further object of the invention is to provide a housing comprising side members or wings arranged to be swung back, wherebyV the face, as wellas the front side of the sheave, is exposed and access thereto is given.

A construction designed to carry out the invention will be hereinafter described, together with other features of the invention.

rlhe invention will be more readily understood from a reading of the following speciiication and by reference to the accompanydrawings, in which an example of the invention is shown and wherein:

Fig. 1 is a frontelevation of a sheave block constructed in accordance with my invention,

Fig. 2 is a rear elevation of the same,

Fig. 8 is a horizontal cross-sectional view taken on the line 3 3 of Fig. l,

Fig. 4 is a transverse vertical sectional view taken on the line et-e't of Fig. 2,

Fig. 5 is a rear elevation of another form in which the invention may be carried out, and

Fig. 6 is av horizontal cross-sectional view on the line 6-6 of Fig. 5.

In the drawings the numeral 10 designates a central vertical partition or center bar, from which upright side bars l1 and 12, 50 respectively, are spaced by spacer blocks or guards 13 welded, o r otherwise secured thereto. The upper ends 10, l1 and l2',

The keeper member has spaced ears 19 on its f lower end receiving an ear 20 on the end of the bill of the hook member. A locking bolt 21 is passed through the ears for securing the parts. lVhen it is desired to thread the lo-wer becket, 'the bolt 21 is withdrawn and the keeper member 8 is swung to one side.

On each vertical edge of the rear bar 1l, I provide hinge ears 22 suitably spaced to receive in alternate relation complementary hinge ears 23, formed on wings or side housing members 24. Pintles 25 passing vertically through the ears hinge the wings to the bar 11. As is shown in Fig. 3, the housing wings 24 each comprise a rear plate 26,

van intermediate plate or member 27 and a front plate 28, all disposed vertically and substantially at right-angles to each other.

The front plates 28 have .their free edges overlapping the front bar 12 and provided with outwardly directed lugs 29 registering with lugs 30 extending outwardly from said bar. Locking bolts or pins 3l passing through the said lugs are secured by nuts 32, whereby the housing wings are locked.: I have shown two sets of ears and bolts, one near the bottom and the otherV near the top of the housing. f

The rear plates 26 and the front plates 28 are inclined at their top and bottom edges toward the side bars from the plates 27` and it will be seen that all of these plates are free from vertical openings, thereby reducing the housing which is entirely enclosed circumferentially.

An axle bolt 33 is passed centrally through the parts 10, 11 and 12 and sheaves 34 are mounted thereon. It will be seen thatthe sheaves are carried entirely by the parts l0, l1 and l2, which form a support. While I have illustrated two sheaves, the block may loeconstructed with one sheave or .a plurality of sheaves. The housing is entirely free The plates 2i are spaced sufficiently from y the faces of the sheaves to fully accommodate the cable lines. I t is preferable to make the guards 13 overhang the sheaves and provide them with notches 13 to receive the cable lines, thus substantially closing the top of the housing. and saving the workmans hands from injury, as will be obvious. The housingfis readily opened by removing the nuts 32 and withdrawing the bolts 31 from the ears 29 `and 30. When the Wings are swung back, as is shown in dotted lines in Fig. 3, it Will'be speen that the faces 'of the sheaves are exposed and free access Athereto may be had. `By removing the lower becket bolt 16 the lower becket may be removed and the cable lin-es easily removed or replaced.` It is obvious that other forms fastening the wings could be used.

As a further illustration of the invention,

. I have shown another form in Figs. 5 and 6 infwhich lall parts-are substantially the same, except the housing and the rear bar of the support. In this form the rear` bar 11a is made substantially the A.same as the center bar 10. The housing comprises a vertical rear plate 40 suitably fastened to the bar 1.1a and the bolts 14, 16 and 33 pass through said plate in this form. Along each verticaledge of the rear plate 40 I form hinge ears 41, s aced to receive similar ears 42 on the rear e ges of wing members 43. The wing members are hinged to the rear plate by vertical Y pintles 44.

Each wingl member comprises a vertical end plate 45 and a front plate 46,"substantially at right angles thereto. Lugs 29 fastened on the front edge of each wing member register with the lugs 30 for receiving the bolts 31 as in the other form. It will bev seen that whenthe bolts 31 arev removed, fthe wing 4inembers-43 may be swung back, as is shown in dotted lines of Fig. 6. This form has the advantage that the block may be laid horizontally with the rear plate 40 next to the derrick floor, -or other platform,

and the housing easily opened.

Various changes in the size and shape of the different parts, as well as modifications and alterations, maybe made within the scope of the append-ed claimsf What I claim, is:

1. In a safety sheave block. a support, a sheave j ournaled on the` support, and a housing carried bythe support and comprising side wings hinged Vto be swung each horizontally when the block is suspended vertically. y Y v 2. In a safety'sheave block, a support, a sheave journaled on the support, a housing carried by the support and comprising side wings hinged to be swung each horizontally when the block is suspended vertically, and means for fastening the wings to close the. housing.`

3. In a safety sheave block, a support, a becket from 4which the support is suspended, a sheave journaled on the support, and a housing carried by the support and including ,side wings mounted to be swung becket from which the support is susi pended, a sheave journaled on the support, a housing carried by the support and including side wings mounted to be swung each horizontally when the block is sus.-

.pen'ded vertically, and means for fastening `the free ends of the wings to the support to close the housing.

6. In a safety sheave block, a support, a becket from which the support is susi pended, guard members on each side of the p. becket at the upper portion ofthe support, a sheave journaled on the support under the guard members, and a housing carried by the support and including side wings mounted on the support t0 be swung .each horizontally when the block is suspended vertically to open and close the housing.

7. Ina safety sheave block, a support, a becketfrom which the support is suspeiidechguard members on each side of the becket at the upper portion of the support, a sheave journaled on the support under the guard members, a housing carried b'y the support and including side wings mounted on the support to be swung each horizontally when the block is suspended vertically to open and close the housing. and means for fastening the wings to close the housing.

8. In a safety sheave block, an upright support, a becket from which the support is suspended, a V sheave journaled on the support, and a housing including wing members hinged tothe rear side of the support for swinging horizontally and fastened to the front of the support.

9. In a safety sheave block, anupright Y hinged to the rear sidev of the support for Y swinging horizontally, and means for detacliablv fastening the lfront edges of theV ywings to the front of the support.

10. In a safety sheave block,l an upright central bar, side bars spaced from the central bar, sheaves journaled 011 each side of the central bar between the side bars, a

5 becket suspending the bars, guard members between the bars overhanging the sheaves, a housing including horizontally swinging Wings carried by the rear side bar, lugs on therfront side bar, other lugs on the Wings registering With the lugs of the front side 10 bar7 and fastening bolts passing throughk said lugs. v

In testimony whereof I aix my signature.

WILLIAM H. MCKISSICK. 

